Plashes Wood

Site of Special Scientific Interest · 51.8668, 0.0050

Also within

Hertfordshire County

Condition (Natural England)

Unfavourable Recovering (4)
UnitFeatureConditionArea (ha)Assessed
TL376203 Unfavourable Recovering 9.97 2017-07-18
TL378205 Unfavourable Recovering 20.38 2017-07-18
TL383208 Unfavourable Recovering 29.43 2017-07-18
TL384202 Unfavourable Recovering 13.44 2017-07-18

Description

Area,71.9 hectares 117.6 ac Description A rich and diverse woodland site consisting largely of oak / hornbeam woodland close to the northern limit of its natural distribution. It is a relatively large wood in a predominantly agricultural part of the county. The rich ground flora reflects the variation in soil types from damp, heavy clays to lighter gravels on the higher ground. Management in the past has also contributed to the structural and species diversity. The principal components are firstly pedunculate oak/ hornbeam Quercus robur / Carpinus betulus as coppice with standards, whose typical ground flora, dominated by bramble Rubus fruticosus, bluebell Hyacinthoides non-scripta and dog's mercury Mercurialis perennis is present, although suppressed by the low light intensity, due to the lack of recent management. Secondly, there are tracts of more open, mixed deciduous woodland influenced by planting and natural regeneration, mainly of pedunculate oak, ash Fraxinus excelsior, beech Fagus sylvatica and silver birch Betula pendula over a mixed shrub layer including hazel Corylus avellana, hornbeam, elder Sambucus nigra and blackthorn Prunus spinosa, with a diversity of ground flora species. There are also areas of coniferous plantation with varying proportions of oak, ash and beech, where despite the suppression of the shrub and field layers, species such as early purple orchid Orchis mascula still survive. Additional valuable habitats are provided by marshy clearings and ponds, wide rides and extensive clearings dominated by bracken Pteridium aquilinum, with an interesting flora including hoary cinquefoil Potentilla argentea.

Species mentioned

English name
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Latin name
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IUCN / Red List Type Family
bracken Pteridium aquilinum LC fern dennstaedtiaceae
bluebell Hyacinthoides non-scripta LC herb liliaceae
dog's mercury Mercurialis perennis LC herb euphorbiaceae
early purple orchid Orchis mascula LC herb orchidaceae
hoary cinquefoil Potentilla argentea LC herb rosaceae
bramble Rubus fruticosus LC herb rosaceae
blackthorn Prunus spinosa LC shrub rosaceae
elder Sambucus nigra LC shrub caprifoliaceae
birch Betula pendula LC tree betulaceae
hornbeam Carpinus betulus LC tree betulaceae
hazel Corylus avellana LC tree corylaceae
beech Fagus sylvatica LC tree fabiaceae
ash Fraxinus excelsior LC tree oleaceae
common oak Quercus robur LC tree fagaceae

Plant communities

W25 — Bracken scrub

Pteridium aquilinum-Rubus fruticosus underscrub

Hedera helix, Acer pseudoplatanus, Fagus sylvatica, Quercus robur, Fraxinus excelsior, Sambucus nigra, Ulex europaeus, Crataegus monogyna, Prunus spinosa, Luzula multiflora, Mnium hornum, Brachythecium rutabulum, Kindbergia praelonga, Angelica sylvestris, Conopodium majus, Heracleum sphondylium, Arum maculatum, Cirsium arvense, Lonicera periclymenum, Silene dioica, Stellaria holostea, Mercurialis perennis, Geranium robertianum, Glechoma hederacea, Teucrium scorodonia, Hyacinthoides non-scripta, Chamerion angustifolium, Circaea lutetiana, Digitalis purpurea, Rumex acetosa, Anemone nemorosa, Ficaria verna, Potentilla erecta, Rosa arvensis, Rosa canina, Rubus fruticosus agg., Rubus idaeus, Galium aparine, Galium mollugo sens.lat., Galium saxatile, Urtica dioica, Viola riviniana, Agrostis capillaris, Anthoxanthum odoratum, Arrhenatherum elatius, Dactylis glomerata, Festuca rubra, Holcus lanatus, Holcus mollis, Poa trivialis, Pteridium aquilinum, Dryopteris dilatata, Dryopteris filix-mas